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<title>Add Options (GNU Compiler Collection (GCC) Internals)</title>

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<h4 class="subsection" id="Features-for-dg_002dadd_002doptions"><span>7.2.4 Features for <code class="code">dg-add-options</code><a class="copiable-link" href="#Features-for-dg_002dadd_002doptions"> &para;</a></span></h4>

<p>The supported values of <var class="var">feature</var> for directive <code class="code">dg-add-options</code>
are:
</p>
<dl class="table">
<dt><code class="code">arm_fp</code></dt>
<dd><p><code class="code">__ARM_FP</code> definition.  Only ARM targets support this feature, and only then
in certain modes; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp_005fok">arm_fp_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">arm_fp_dp</code></dt>
<dd><p><code class="code">__ARM_FP</code> definition with double-precision support.  Only ARM
targets support this feature, and only then in certain modes; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp_005fdp_005fok">arm_fp_dp_ok effective target keyword</a>.
</p>
</dd>
<dt><code class="code">arm_neon</code></dt>
<dd><p>NEON support.  Only ARM targets support this feature, and only then
in certain modes; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fneon_005fok">arm_neon_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">arm_fp16</code></dt>
<dd><p>VFP half-precision floating point support.  This does not select the
FP16 format; for that, use <a class="ref" href="#arm_005ffp16_005fieee">arm_fp16_ieee</a> or
<a class="ref" href="#arm_005ffp16_005falternative">arm_fp16_alternative</a> instead.  This
feature is only supported by ARM targets and then only in certain
modes; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp16_005fok">arm_fp16_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">arm_fp16_ieee</code></dt>
<dd><a class="anchor" id="arm_005ffp16_005fieee"></a><p>ARM IEEE 754-2008 format VFP half-precision floating point support.
This feature is only supported by ARM targets and then only in certain
modes; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp16_005fok">arm_fp16_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">arm_fp16_alternative</code></dt>
<dd><a class="anchor" id="arm_005ffp16_005falternative"></a><p>ARM Alternative format VFP half-precision floating point support.
This feature is only supported by ARM targets and then only in certain
modes; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp16_005fok">arm_fp16_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">arm_neon_fp16</code></dt>
<dd><p>NEON and half-precision floating point support.  Only ARM targets
support this feature, and only then in certain modes; see
the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fneon_005ffp16_005fok">arm_neon_fp16_ok effective target keyword</a>.
</p>
</dd>
<dt><code class="code">arm_vfp3</code></dt>
<dd><p>arm vfp3 floating point support; see
the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fvfp3_005fok">arm_vfp3_ok effective target keyword</a>.
</p>
</dd>
<dt><code class="code">arm_arch_v8a_hard</code></dt>
<dd><p>Add options for ARMv8-A and the hard-float variant of the AAPCS,
if this is supported by the compiler; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005farch_005fv8a_005fhard_005fok">arm_arch_v8a_hard_ok</a> effective target keyword.
</p>
</dd>
<dt><code class="code">arm_v8_1a_neon</code></dt>
<dd><p>Add options for ARMv8.1-A with Adv.SIMD support, if this is supported
by the target; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fv8_005f1a_005fneon_005fok">arm_v8_1a_neon_ok</a>
effective target keyword.
</p>
</dd>
<dt><code class="code">arm_v8_2a_fp16_scalar</code></dt>
<dd><p>Add options for ARMv8.2-A with scalar FP16 support, if this is
supported by the target; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fv8_005f2a_005ffp16_005fscalar_005fok">arm_v8_2a_fp16_scalar_ok</a> effective
target keyword.
</p>
</dd>
<dt><code class="code">arm_v8_2a_fp16_neon</code></dt>
<dd><p>Add options for ARMv8.2-A with Adv.SIMD FP16 support, if this is
supported by the target; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fv8_005f2a_005ffp16_005fneon_005fok">arm_v8_2a_fp16_neon_ok</a> effective target
keyword.
</p>
</dd>
<dt><code class="code">arm_v8_2a_dotprod_neon</code></dt>
<dd><p>Add options for ARMv8.2-A with Adv.SIMD Dot Product support, if this is
supported by the target; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fv8_005f2a_005fdotprod_005fneon_005fok">arm_v8_2a_dotprod_neon_ok</a> effective target keyword.
</p>
</dd>
<dt><code class="code">arm_fp16fml_neon</code></dt>
<dd><p>Add options to enable generation of the <code class="code">VFMAL</code> and <code class="code">VFMSL</code>
instructions, if this is supported by the target; see the
<a class="ref" href="Effective_002dTarget-Keywords.html#arm_005ffp16fml_005fneon_005fok">arm_fp16fml_neon_ok</a> effective target keyword.
</p>
</dd>
<dt><code class="code">arm_dsp</code></dt>
<dd><p>Add options for ARM DSP intrinsics support, if this is supported by
the target; see the <a class="ref" href="Effective_002dTarget-Keywords.html#arm_005fdsp_005fok">arm_dsp_ok effective target
keyword</a>.
</p>
</dd>
<dt><code class="code">bind_pic_locally</code></dt>
<dd><p>Add the target-specific flags needed to enable functions to bind
locally when using pic/PIC passes in the testsuite.
</p>
</dd>
<dt><code class="code">float<var class="var">n</var></code></dt>
<dd><p>Add the target-specific flags needed to use the <code class="code">_Float<var class="var">n</var></code> type.
</p>
</dd>
<dt><code class="code">float<var class="var">n</var>x</code></dt>
<dd><p>Add the target-specific flags needed to use the <code class="code">_Float<var class="var">n</var>x</code> type.
</p>
</dd>
<dt><code class="code">ieee</code></dt>
<dd><p>Add the target-specific flags needed to enable full IEEE
compliance mode.
</p>
</dd>
<dt><code class="code">mips16_attribute</code></dt>
<dd><p><code class="code">mips16</code> function attributes.
Only MIPS targets support this feature, and only then in certain modes.
</p>
</dd>
<dt><code class="code">stack_size</code></dt>
<dd><a class="anchor" id="stack_005fsize_005fao"></a><p>Add the flags needed to define macro STACK_SIZE and set it to the stack size
limit associated with the <a class="ref" href="Effective_002dTarget-Keywords.html#stack_005fsize_005fet"><code class="code">stack_size</code> effective
target</a>.
</p>
</dd>
<dt><code class="code">sqrt_insn</code></dt>
<dd><p>Add the target-specific flags needed to enable hardware square root
instructions, if any.
</p>
</dd>
<dt><code class="code">tls</code></dt>
<dd><p>Add the target-specific flags needed to use thread-local storage.
</p>
</dd>
<dt><code class="code">weak_undefined</code></dt>
<dd><p>Add the flags needed to enable support for weak undefined symbols.
</p></dd>
</dl>

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